Web-guide for printing-presses.



No. 896,736. PATENTED AUG. 25, 1908.

R. MASON. WEB GUIDE FOR PRINTING PRESSES.

APPLICATION FILED OCT. 20, 1905.

2 SHEETSSHEET l.

WITNESSES.

A TTOHWEV$ N0. 896,736. PATENTED AUG. 25, 1908. R. MASON.

WEB GUIDE FOR PRINTING PRBSSESH APPLICATION FILED on. 20, 1905.

2 SHEETS-SHEET 2.

WITNESSES: l/E NTOI? MOJZLQAM AJTTORAEYJ rrrrnivr OFFICE.

ROBERT MASON, OF NEW HAMPSHIRE, ASSIGXOR TO KIDDER- PRESSCOMPANY, OFDOVER, NEW HAMPSHIRE. A CORPORATION OF WEST VIRGINIA.

WEB-GUIDE FOR PRINTING-PBESSES so. assist;-

Specification of Letters Patent.

Patented Aug. 25, 1908.

Application filed October 20, 1905. Serial No. 283,573.

To ,oilwhomljit m; it knownthat I, ROBERT Mason, resid- Dover, in thecounty of Stratt'ord and of New Hampshire, have invented cercwand usefulImprovements in VVeb- Guides for Printing-Presses, of which thefollowing is a full, clear, and exact description,

twecn the members of the printing couple,

' said means also operating to maintain the sheet in contact with theotlset web traveling over the impression cylinder of said printingcouple.

Other objects will be in part obvious and in partpointed outhereinafter.

lhcmvcntion accordingly consists in the features of construction,combinations of elements and arrangen ient of parts which will beexemplified in the ncchanism hereinafter described and the scope of theapplication ol which will be indicated in the following claims.

in the accompanying drawings, wherein isshown diagrammaticallyone ofthevarious possible embodiments otmy invention: Fig ,ure 1 is a sideelevation of the same. Fig. 2

is a front elevation of the same. .imilar reference characters refer tosimiinparts throughoutboth i iews of the drawings. I

-"Prior to entering into a description of the speciiicfeatures of myinvention and in order to render certain of the objects thereof cleareroi' undcrstamling, it may here be noted that; in printing presseswherein the otl'sct wcb carried upon the impression nderwf a. printingcouple, gri ipers cannot be employed to transfer the sheet overthoimpression cylim raccount of the interference of the web. In priorconstructions, endless 'ta'pe's or bands'have been employed in thisrelation, but the use of such tapes or hands has proven impracticablefor many reasons, among which are their liability to 'slip and thefrequency with which it has been'found necessary to renew or re-' placethem. i

To accomplish the above results with the avoidance of the disadvantagesinherent in other mechanisms employed for this purpose, I have found itdesirable to provide a plurality of independent rolls suitably mountedfor rotation and so arranged with respect to the impression cylinder asto guide the sheet thereover and deliver the same between the members ofthe printing couple. I have also provided means whereby the sheet isheld yieldingly in contact with the offset web traveling over theimpression cylinder. The above and other advantages are secured inconstructions of the nature of that hereinafter described.

Referring now to the drawings, there is shown at A in the presentinstance a perfecting form cylinder, which cooperates with a perfectingimpression cylinder B. Impression cylinder B has traveling thereover anoffset web C unwinding and rewinding upon suitable rolls, not hereinshown, as they of themselves comprise n0 essential part of my presentinvention.

I) indicates housings suitably carried by the frame of the printingpress, said housings having curved peripheries, as at 1, arranged inproximity to impression cylinder E. The housings D are designed in thepresent instance to support rotatably the means adapted to guide thesheet over the impression cylinder and maintain the same in contactwith-the offset web. It may here be noted that, while in thisillustrative embodiment, as shown in; Fig. 2, I have shown impressioncylinder B as provided with three independent housings, it is obvi-. ousthat a greater or less number may be employed, although the number shownis particularly well adapted to accomplish the purposes of my invention.Housings D and the means carriedthereby are similar in all respects anda description of one will, therefore, sufticcv The upper end of housingD is arranged in proximity to impression c linder B and extends within asubstantial y V-shaped spaceprised by said form an impression cylinders.

Pivotally mounted at 2 upon lugs 3 cast upon housing 1) are-levers 4,eachadapted.

rotatably to support at 5 transfer ro Springs 7- carried by pins .8.extending from lugs 9, cast upon housing D exert pressure upon the freeends of levers 4 to maintaintransfer rolls 6 yieldingly against oflsetweb C traveling over impression cylinder B. Set screws 7 extend throughthreaded 0 enings in housing D and normally have t eir inner endsarranged in proximity but out of contact with thefree ends of levers 4.

The operation of my invention, which should be largely obvious from theabove description, is substantially as follows: The sheet upon itsdelivery from the preceding printing couple-enters the opening providedetween the ower ends of housings D and impression cylinde B, and isguided between the lowermost 0 transfer rolls 6 and offset web Ctraveling over impression cylinder B, with its freshly printed surfacein contact with the offset web C. As will be understood, oifset web Ccarries the sheet over impression cylinder B, delivering the samebetween the members of the perfecting printing cou le. over t eimpression cylinder B, transfer rolls 6 yieldingly maintain the'same incontact with the offset web'C. Set screws 7 may be manipulated to forcetransfer rolls 6 out of contact with offset web C, when it becomesnecessary to thread a new offset web between housings D and impressioncylinder B. Set screws 7 also operate to limit the pivotal movement oflevers 4 and maintain the transfer rolls 6 in substantially the samerelative position when, for any reason, the impression cylinder B isremoved from the press."

It will accordingly beseen that I have pro vided mechanism well adaptedto achieve the objects of my invention, which is characterized bysimplicity of structure coupled with efficiency of action, the severalparts cooperating to perform their functions with a minimum of wear.

It will, of course, be obvious that, while I have shown my invention inthe relation above described, I do not intend to so limit itsemployment, as the same is well adapted for use in many other analogousrelations in other machines of this type. i

As many changes cou d be made in the above construction and manyapparently During the passage of the sheet widely diflierent embodimentsof my inven contained in the above description or shown in the accomanying drawings shall be; interpreted as il ustrative and not in alimiting sense. I desire it also to be understood that thelanguage usedin the following claims is intended to cover all of the generic andspecific features of 'the invention hereindescribed and all statementsof the scope of the invention which, as a matter of language, might besaid to fall therebetween.

Having described my invention, what I claim as new and desire to secureby Letters Patent, is

1. In mechanism of the class described, the combination with a printingcouple comprising a form cylinder and an impression cylinder, of meansfor guiding a sheet about the impression cylinder and for delivering thesheet between said cylinders comprising a rigid member which extendspartly about the impression cylinder and conforms substantially to the.contour thereof, said member having a plurality of journal studsdisposed at difierent points in the length thereof, a lever journaledupon each of said studs,

a pressure roller journaled upon one end of each of said levers, andsprings engaging opposite ends of said levers whereby the pressurerollers areforced into engagement with the impression cylinder.

2. In mechanism of the class described, I

the combination with a printing couple comprising mating form andimpression cylinders and an oifsetweb which travels over the impressioncylinder, of means for guiding a sheet over said impression cylinder andmaintaining the same in contact with the offset web comprising aplurality of rigid members which extend partly about the impressioncylinder and conform substantiallyto the contour thereof, each of saidmembers being rovided with a plurality of integral journa studs disposedalong the length thereof, a lever mounted upon each of said journalstuds, a pressure roller mounted upon one end of each of said levers,aspring engaging the opposite end of each of said levers for urgin thepressure rollers into engagement wit the sheet, and adjustable abutmentsthreaded through portions of said rigid members to limit the swingingmovement of said levers.

' In testimony whereof I affix my signature, in the presence. of twowitnesses.

ROBERT MASON.

Witnesses G. WnirNEY, G. R. -Wr1irimms.

